前言
最近專案有一個節點進度條的小需求，完成后，想分享出來希望可以幫到有需要的同學，
真機效果圖
自定義View完整代碼
開箱即用~，注釋已經炒雞詳細了
/**
* @description: 節點進度條
* @author: DMingO
* @date: 2020/4/15
*/
public class PointProcessBar extends View {
/**
* 未選中時的連線畫筆
*/
private Paint mLinePaint;
/**
* 選中時的連線畫筆
*/
private Paint mLineSelectedPaint;
/**
* 未選中時的文字畫筆
*/
private Paint mTextPaint;
/**
* 選中時的文字畫筆
*/
private Paint mTextSelPaint;
/**
* 未選中時的實心圓畫筆
*/
private Paint mCirclePaint;
/**
* 選中時的內部實心圓畫筆
*/
private Paint mCircleSelPaint;
/**
* 選中時的邊框圓畫筆
*/
private Paint mCircleStrokeSelPaint;
/**
* 未選中時的線，節點圓的顏色
*/
private int mColorUnselected = Color.parseColor("#1ca8b0d9");
/**
* 選中時的顏色
*/
private int mColorSelected = Color.parseColor("#61A4E4");
/**
* 未選中的文字顏色
*/
private int mColorTextUnselected = Color.parseColor("#5c030f09");
/**
* 繪制的節點個數，由底部節點標題數量控制
*/
int circleCount ;
/**
* 連線的高度
*/
float mLineHeight = 7f;
//圓的直徑
float mCircleHeight = 50f;
float mCircleSelStroke = 8f;
float mCircleFillRadius = 15f;
//文字大小
float mTextSize = 35f;
//文字離頂部的距離
float mMarginTop = 40f;
/**
* 首個圓向中心偏移的距離
*/
float marginLeft = 30f;
/**
* 最后一個圓向中心偏移的距離
*/
float marginRight = marginLeft;
/**
* 每個節點相隔的距離
*/
float divideWidth;
int defaultHeight;
/**
* 節點底部的文字串列
*/
List<String> textList = new ArrayList<>();
/**
* 文字同寬高的矩形，用來測量文字
*/
List<Rect> mBounds;
/**
* 存盤每個圓心在同一直線上的節點圓的 x 坐標值
*/
List<Float> circleLineJunctions = new ArrayList<>();
/**
* 選中項集合
*/
Set<Integer> selectedIndexSet = new HashSet<>();
public PointProcessBar(Context context) {
super(context);
}
public PointProcessBar(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
initPaint();
}
public PointProcessBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public PointProcessBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
/**
* 初始化畫筆屬性
*/
private void initPaint(){
mLinePaint = new Paint();
mLineSelectedPaint = new Paint();
mCirclePaint = new Paint();
mTextPaint = new Paint();
mCircleStrokeSelPaint = new Paint();
mTextSelPaint=new Paint();
mCircleSelPaint = new Paint();
mLinePaint.setColor(mColorDef);
//設定填充
mLinePaint.setStyle(Paint.Style.FILL);
//筆寬像素
mLinePaint.setStrokeWidth(mLineHeight);
//鋸齒不顯示
mLinePaint.setAntiAlias(true);
mLineSelectedPaint.setColor(mColorSelected);
mLineSelectedPaint.setStyle(Paint.Style.FILL);
mLineSelectedPaint.setStrokeWidth(mLineHeight);
mLineSelectedPaint.setAntiAlias(true);
mCirclePaint.setColor(mColorDef);
//設定填充
mCirclePaint.setStyle(Paint.Style.FILL);
//筆寬像素
mCirclePaint.setStrokeWidth(1);
//鋸齒不顯示
mCirclePaint.setAntiAlias(true);
//選中時外框空心圓圈畫筆
mCircleStrokeSelPaint.setColor(mColorSelected);
mCircleStrokeSelPaint.setStyle(Paint.Style.STROKE);
mCircleStrokeSelPaint.setStrokeWidth(mCircleSelStroke);
mCircleStrokeSelPaint.setAntiAlias(true);
//選中時的內部填充圓畫筆
mCircleSelPaint.setStyle(Paint.Style.FILL);
mCircleSelPaint.setStrokeWidth(1);
mCircleSelPaint.setAntiAlias(true);
mCircleSelPaint.setColor(mColorSelected);
//普通狀態的文本 畫筆
mTextPaint.setTextSize(mTextSize);
mTextPaint.setColor(mColorTextDef);
mTextPaint.setAntiAlias(true);
mTextPaint.setTextAlign(Paint.Align.CENTER);
//選中后的文本畫筆
mTextSelPaint.setTextSize(mTextSize);
mTextSelPaint.setColor(mColorSelected);
mTextSelPaint.setAntiAlias(true);
mTextSelPaint.setTextAlign(Paint.Align.CENTER);
}
/**
* 測量文字的長寬，將文字視為rect矩形
*/
private void measureText(){
mBounds = new ArrayList<>();
for(String name : textList){
Rect mBound = new Rect();
mTextPaint.getTextBounds(name, 0, name.length(), mBound);
mBounds.add(mBound);
}
}
/**
* 測量view的高度
*/
private void measureHeight(){
if (mBounds!=null && mBounds.size()!=0) {
defaultHeight = (int) (mCircleHeight + mMarginTop + mCircleSelStroke + mBounds.get(0).height()/2);
} else {
defaultHeight = (int) (mCircleHeight + mMarginTop+mCircleSelStroke);
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec);
//寬高都設定為wrap_content
if(widthSpecMode == MeasureSpec.AT_MOST && heightSpecMode == MeasureSpec.AT_MOST){
//寬設定為wrap_content
setMeasuredDimension(widthSpecSize,defaultHeight);
}else if(widthSpecMode == MeasureSpec.AT_MOST){
setMeasuredDimension(widthSpecSize,heightSpecSize);
}else if(heightSpecMode == MeasureSpec.AT_MOST){
//高設定為wrap_content
setMeasuredDimension(widthSpecSize, defaultHeight);
}else{
//寬高都設定為match_parent或具體的dp值
setMeasuredDimension(widthSpecSize, heightSpecSize);
}
}
@Override
protected void onDraw(Canvas canvas) {
//若未設定節點標題或者選中項的串列，則取消繪制
if (textList == null || textList.isEmpty() ||
selectedIndexSet == null || selectedIndexSet.isEmpty() ||
mBounds == null || mBounds.isEmpty()) {
return;
}
//畫灰色圓圈的個數
circleCount=textList.size();
//每個圓相隔的距離（重要），可以通過這個調節節點間距
divideWidth = (getWidth() - mCircleHeight ) / (circleCount - 1);
//繪制文字和圓形
for (int i=0; i < circleCount ;i++){
float cx;
float cy;
float textX;
if (i==0){
//第一個節點，圓心需要向右偏移
cx = mCircleHeight / 2 + i * divideWidth + marginLeft;
cy = mCircleHeight / 2 + mCircleSelStroke;
textX = cx;
circleLineJunctions.add(cx + mCircleHeight / 2);
}else if (i==textList.size()-1){
//最后一個節點，圓心需要向左偏移
cx = mCircleHeight / 2 + i * divideWidth - marginRight;
cy = mCircleHeight / 2 + mCircleSelStroke;
textX = cx;
circleLineJunctions.add(cx - mCircleHeight / 2);
}else {
//中間部分的節點
cx = mCircleHeight / 2 + i * divideWidth;
cy = mCircleHeight / 2+mCircleSelStroke;
textX = cx;
circleLineJunctions.add(cx - mCircleHeight / 2);
circleLineJunctions.add(cx + mCircleHeight / 2);
}
if (getSelectedIndexSet().contains(i)){
//若當前位置節點被包含在選中項Set中，判定此節點被選中
canvas.drawCircle(cx , cy, mCircleHeight / 2, mCircleStrokeSelPaint);
canvas.drawCircle(cx, cy, mCircleFillRadius, mCircleSelPaint);
canvas.drawText(textList.get(i), textX, (float) (mCircleHeight + mMarginTop +mCircleSelStroke+mBounds.get(i).height()/2.0), mTextSelPaint);
}else {
//若當前位置節點沒有被包含在選中項Set中，判定此節點沒有被選中
canvas.drawCircle(cx , cy, mCircleHeight / 2, mCirclePaint);
canvas.drawText(textList.get(i), textX, (float) (mCircleHeight + mMarginTop +mCircleSelStroke+mBounds.get(i).height()/2.0), mTextPaint);
}
}
for(int i = 1 , j = 1 ; j <= circleLineJunctions.size() && ! circleLineJunctions.isEmpty() ; ++i , j=j+2){
if(getSelectedIndexSet().contains(i)){
canvas.drawLine(circleLineJunctions.get(j-1),mCircleHeight/2+mCircleSelStroke,
circleLineJunctions.get(j) ,mCircleHeight/2+mCircleSelStroke,mLineSelectedPaint);
}else {
canvas.drawLine(circleLineJunctions.get(j-1),mCircleHeight/2+mCircleSelStroke,
circleLineJunctions.get(j) ,mCircleHeight/2+mCircleSelStroke,mLinePaint);
}
}
}
/**
* 供外部呼叫，顯示控制元件
* @param titles 底部標題內容串列
* @param indexSet 選中項Set
*/
public void show(List<String> titles , Set<Integer> indexSet){
if(titles != null && ! titles.isEmpty()){
this.textList = titles;
}
if(indexSet != null && ! indexSet.isEmpty()){
this.selectedIndexSet = indexSet;
}
measureText();
measureHeight();
//繪制
invalidate();
}
/**
* 更新底部節點標題內容
* @param textList 節點標題內容串列
*/
public void refreshTextList(List<String> textList) {
this.textList = textList;
measureText();
measureHeight();
invalidate();
}
/**
* 獲取節點選中狀態
* @return 節點選中狀態串列
*/
public Set<Integer> getSelectedIndexSet() {
return selectedIndexSet;
}
/**
* 更新選中項
* @param set 選中項Set
*/
public void refreshSelectedIndexSet(Set<Integer> set) {
this.selectedIndexSet = set;
invalidate();
}
}
注意點
- 控制元件的節點總個數是與傳入的節點底部標題串列中元素個數控制（相同）的，簡而言之就是傳入的標題串列中有多少個標題，節點就會繪制多少個
- 控制元件通過show方法進行View的初始化和顯示內容，傳入節點標題串列和節點選中項集合，控制View的選中狀態和顯示的內容
- 控制元件初始化顯示后，可以通過refreshTextList(),refreshSelectedIndexSet() 更新標題和選中項
- 具體不同的顏色，大小可以具體在View中調整
總結
可以看到效果不復雜，因此自定義View的代碼行數不多，也很容易看懂，直接拿走代碼即可在專案中食用啦，
由于不同專案設計稿會有不同，這里也僅僅給有需要的同學一個思路，可以改造具體實作代碼~
謝謝閱讀到這里的同學~歡迎與我討論和交流
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標籤：Android
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